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Every day Saddam remains in power with chemical weapons, biological weapons, and the development of nuclear weapons is a day of danger for the United States.

Proliferation of nuclear weapons to terrorist organisations is far more dangerous than proliferation of nuclear weapons to states, even states like North Korea.

We are categorically against proliferation of nuclear weapons.

The combination of hatred and technology is the greatest danger threatening mankind.

The message from national security experts and citizens around the world is clear: The only way to eliminate the global nuclear danger is to eliminate all nuclear weapons.

I agree that a nuclear Iran is extremely dangerous, and I believe that it must be prevented.

Those are the things that, in the wrong hands - and certainly in our war on terrorism we also must attack proliferation and those nations that proliferate with chemical, biological and nuclear type devices, because that can cause the most catastrophic results.

We must not let ourselves be swept off our feet in horror at the danger of nuclear power. Nuclear power is not infinitely dangerous. It's just dangerous, much as coal mines, petrol repositories, fossil-fuel burning and wind turbines are dangerous.

Weapons of mass destruction violate more than individual lives - they cross international borders and jeopardize all people. They also drain resources that could be used instead for medicines, schools and other life-saving supplies. We must come together with even greater determination to prevent a WMD nightmare.

The greatest threat that the world faces is a nuclear Iran. A nuclear North Korea is already troubling enough.